4 Written Questions
3 Multiple Choice Questions
- allows us to indirectly date fossils up to billions of years old based on minerals in surrounding volcanic strata
- Ivy leaf and pine needle
3 True/False Questions
Why do some scientists believe that RNA, rather than DNA, was the first genetic material?
All the proto-cells on early Earth contained RNA.
RNA has both information storage and catalytic properties.
RNA could have evolved into DNA.
RNA can replicate more accurately than DNA.
RNA contains uracil in place of thymine → RNA has both information storage and catalytic properties.
Evolution works by _____.
"tinkering" with existing structures
predicting the future
molding the environment to conform to the organisms living in it
constantly increasing complexity
converging on a particular phenotype → "tinkering" with existing structures
Earth probably formed _____ years ago, and the first life evolved as early as _____ years ago.
4.5 billion years ago ... 3.9 billion years ago
Humans observed neither event, so there is no way to tell.
6,000 years ago ... 6,000 years ago
3.9 million years ago ... 2.0 billion years ago
10 billion years ago ... 4.5 billion years ago → allows us to indirectly date fossils up to billions of years old based on minerals in surrounding volcanic strata